Phonograph



In ven for Afforneys L. GOLDHAMMER PHONOGRAPH Filed June 9, 1933 June 4, 1935.

.,the stylus touches 245 roller The arm and is moreover movable in a direction trans- Y Patented June 4, 1935 I v UNITED STATES PATENT OFFICE Farbenindustrie Aktiengesellschalt,

firankfort-on-the-Main, Germany Application June 9, 1933, Serial No. 675,126 In Germany June 16, 1932 8Claims.

My present invention relates to a phonograph for band-shaped sound carriers bearingseveral parallel sound tracks.

One of its objects is to provide for an easy and gradual removal and setting of the sound box and the stylus from and on the film. Another object is to simplify the transfer of the sound box when a band bears a plurality of sound grooves or tracks from one sound groove onto another when the performance of a musical piece is finished. Further objects will be seen from the detailed specification following hereafter. Reference is made to the accompanying drawing in which Fig 1 is a side, view of the device according to this invention. Fig, 2 is a plan view of the same device partially in section.

According to this invention the adjustmentof the stylus on the sound carrier is facilitated by disposing an eccentric between the stylus and the pivoting axis of the arm carrying the sound box, whereby this arm can be gradually lifted and lowered in the direction vertical to the bandlike sound carrier. Furthermore according to this invention a bolt with a coarsely pitched thread is located inside the axle of the box arm thus-allowing movement of the arm axially, i. e. transversely to the travelling direction of the sound band.

In order to bring the stylus into engagement with the desired sound groove the lateral move- -ment of the arm carrying the sound box is controlled by a milled provided on the threaded bolt. This disk bea'rs marks and notches, numbered in accordance with the sound grooves prodisk to the desired mark, the sound arm is laterally moved by spring action so as to engage the desired sound groove.

The invention will now be described in detail with reference to the accompanyi drawing.

, When the apparatus is in operation the box arm i I with the sound box 2 bearing the stylus 3 rests jon the sound band 4 which at the point where the record is supported by a I can be liftedand lowered versely to the travel of film.

The lifting'and lowering motion of the sound arm I is effected by an eccentric which can be 0 rotated-by means of the milled knob I. In order .to ensure an exact adjustment the arm I is provided with an adjusting pin 8, the position of whichis controllable with respect to the arm I and which alone comes in contact withthe eccentric 4 Theopening'l inthe arm-I isdlmen-- vided on the mund carrier. .By adjusting the (Cl. file-11) sionedsuch that the eccentric 6 can freely turn inside the arm I. r The axle of the eccentric Ill forms at its end situated behind the base plate II of the apparatus a portion I2 flattened on two sides and a spring I3 is pressed against this por- 5 tion I2 (see Fig. l) By this means the eccentric is stopped at its highest and lowest position.

As the sound band bears several parallel sound tracks I4, it is necessary that the box arm can also be adjusted transversely to the travelling 10 direction of the film. In the construction according to this invention this is realized by providing, within the axle I5 around which the sound arm I is tiltable, a bolt I6 threadedly engaging said axle with a thread of coarse pitch. This bolt I6 bears ll! at its one end an adjusting disk II, the other end Ilia of the threaded bolt being screwed out of or into the axle I5 of the sound arm by turning the adjusting disk. In this manner the. sound arm by its contact with the end of the bolt I641 20 is more or less displaced in direction of the arrow, 1. e. transversely to the travelling direction of the sound band. For exactly controlling the transverse movement, there is provided a set screw I9 iixedto the part III of the sound arm I 25 which embraces the bolt Ii in form of a cap. By means of this screw I! the stylus can'be adjus'ted exactly so that it engages the outermost sound groove I4a;

The adjusting disk I] has a on its side nearest thespectator bears a scale 20 each mark of which corresponds to a sound groo've I4., Besides the numbers, disk ll bears notches- II, which are engaged by-a pin 22 located in the housing 2: and pressed against the disk by means ofa spring.. By this device the scale disk H can be adjusted and arrested in any position of the arm I in a direction transverse to the direction of travel of the sound carrier. The casing 23, furthermore has an inspection opening 24 through 4 which onlythat number on the scale 20 is visiblewhlch corresponds with the sound groove which the stylus engage- When turning the threaded bolt 16 backward into its zero position bymeansofthediskll,thearmlwillautomatically follow the movement of the bolt, as the spring "byway of the arm and screw I! constantly presses the end I. of the sound arm, embracing the'bolt a in'the way of a. cap. against the bolt end "a shown beside thespring 2!). In consequence,

afterturnlngthe scale diskl'l inits ser'o position, that is when the number I is seen in the 1 opening 24 in the present case, the stylus will engage the first sound groove "a N milled edge and 30 (cf. the arm w,

' manufacture and differences in the spacing of the sound grooves H, which may be due to shrinkage of the film, the sound arm I is subdivided along line la. That piece of the arm I carryingthe sound box 2 is connected with the piece 30 hinged to the axle I! by a pin 28. The pin 29 is fixedly mounted on the part 3|, but does not exactly fit in'theother part of the box arm, but with some circumferential play, so that the box 2 and the stylus I inserted therein can swing by fractions of a millimeter in the direction of travel of the sound band in case the sound groove is somewhat displaced with regard to the position of the stylus controlled by the disk II.

The device according to this invention may be used for the recording or reproduction of sound.

What I claim is:

' 1. In a phonograph apparatus, in combination, a' sound arm comprising a first and a. second part, means for movably connecting said two parts of said sound arm, a sound box connected with the first part of said soundvarm, a base plate, an axle fixedly mounted on said base plate, the second part of said sound arm being rotatable about this axle, and means cooperating with said base'plate and said second part for displacing said second part in the direction of said axle.

2. In a phonograph apparatus, in combination asoundarmcomprisingafirstpartmdasec- 0nd part, a pin fixedly mounted on said second part and connected with said first part so that the latter is slightly rotatable about said pin, a sound box connected with the first part of said sound arm, a base plate, an axle fixedly mounted on said base plate and provided with a boring, said second part'embracing said axle in form of a cap, a bolt screw--threaded in saidboring provided with a knob and means for said second part against said bolt.

3. In a phonograph apparatus, in combination a sound arm comprising a first part and a sec-' 0nd part, a pin fixedly mounted on said second part and connected with said first part so that the latter is slightly rotatable about said pin, a sound box connected with the first part of said sound arm, a base plate, an axle fixedly mounted on said base plate and provided with a boring, said second part embracing said axle in form of a'cap,'a bolt screw threaded in said boring provided with a knob, a screw fixed to said cap so that it bears against said bolt, thus allowingtovarythedlstanceofsaidsecondpartfrun said bolt, a hollow shaft moimted on said base plate; a shaft and a spring mounted in said hollow shaft, said spring p said shaft in the direction of said base plate, a lever mounted on said shaft perpendicularly to the same a screw -fixed to saidlever, said lever being rotatable with .sa'id shaftinsaidhollow shaftsothatthe screw fixed on it can be brought in engagement with said screw on said cap, thus preming by the action of said pr said second part against said bolt 4 (In a apparatus, in combination a sound arm comprising a first part and aj'second part, a pin fixedly mounted on said second part connected with said first so that the latter is slightly rotatable about said pin, a sound box connected with the first part, an opening provided in said first part and means engaging said first part for gradually lifting and lowering" said sound box, a base plate, an axle fixedly mounted on said base plate and provided with a boring, said second part embracing said axle in form of a cap, a bolt screw threaded in said boring provided with a, knob, a screw fixed to said cap so that it bears against said bolt, .thus allowing to vary the distance of said second part from said bolt, a hollow shaft mounted on said base plate, a shaft and a spring, mounted in said hollow shaft, said spring pressing said shaftin the direction of said base plate, a lever mounted on said shaft perpendicularly to the same a screw fixed to said lever, said lever being rotatable with said shaft in said hollow shaft so that the screw fixed on it can be brought in engagement with 7 said opening so that on rotation of said eccentric said sound arm is lifted or lowered, an axle fixedly mounted on said base plate and provided with a boring, said second part embracing said axle in form of a cap, a bolt screw threaded in said boring provided with a knob, a screw fixed to said cap so that it bears against said bolt, thus allowing to vary the distance of'said second part from said bolt, a hollow shaft mounted on said base plate, a shaft and a spring mounted in said hollow shaft, said spr g Pressing said shaft in the direction of said base plate, a lever mounted on said shaft perpendicularly to the same a screw fixed-to said lever, said lever being rotatable with said shaft in said hollow shaft so that the screw fixed on it can be brought in engagement with said screw on said cap, thus pressing by the action of said spring said second part against said bolt.

6. In a phonograph apparatus, in combination asoundarmcomprisingafirstpartandasecond part, a pin fixedly mounted on said second part and connected with said first part so that the latter is slightly rotatable about said pin, a sound box connected with the first part, an opening provided in said first part, a'base plate, a shaft rotatably mounted on said base plate, an eccentrlc fixed on said shaft and engaging said opening so that on rotation of said eccentric said sound arm is lifted or lowered, means for fixing said eccentric in its highest and lowest position, an axle fixedly mounted on said base plate and provided with a boring, said second part embracing said axle in form of-a cap, a bolt screw threaded in said boring provided with a knob, a-screw fixedto said capso that it bears against said bolt, thus allowing to vary the distance of said second part from said bolt, a hollow shaft mounted on said base plate, a shaftmd a swing mounted in said hollow shaft. said spring pressing said shaft in the direction of said base plate shaftsothat the screwfixedonitcanbebrought inengagementwithsaidscrewon saidcap,thus pressing by the action of said spring said second part against said bolt.

7; In a phonograph apparatus, in combination;

asoundarmoomprisingafirstpartandasecond part, a pin fixedly mounted on said second part and connected with said first-part so that the latter is slightly rotatable about said pin, a sound box connected with the first part, an opening provided in said first part, a base plate, a shaft rotatably mounted on said base plate and having two flattened portions opposite to each other, an eccentric fixed on said shaft and eng in said opening so that on rotation of said eccentric said sound arm is lifted or lowered, a spring mounted on said base plate and bearing against said shaft at the position of said flattened portions so that saideccentric is stopped in its upper and lower position,anaxlefixedlymountedonsaidbase plate and provided with a boring, said second part embracing said axle in form of a cap, a bolt screw threaded in said boring provided with a knob,ascrewfixedtosaidcapsothatitbears against said bolt, thus allowing to vary the distance of said second part from said bolt, a hollow shaft moimted on said base plate, a shaft and a spring moimted in said hollow shaft, said spring p said shaft in the direction of said base plate, a lever mounted on said shaft perpendicularly to the same a screw fixed to said lever, said lever being rotatable with said shaft in said hollow shaft so that the screw fixed on it can be brought in engagement with said screw on said cap, thus pressing by the action of said spring said second part against said bolt.

8. In a phonograph apparatus, in combination asoundarmcomprisingafirstpartandasecnd part. a pin fixedly mounted on said second part and connected with said first part so that the latter is slightly rotatable about said pin, a

.sound box connected with the first part, an opening provided in said first part. a base plate, a shaft rotatably mounted on said base plate and having two flattened portions opposite to each other, an eccentric fixed on said shaft and en- 8 8m! said opening so that on rotation of said eccentric said sound arm is lifted or lowered, a spring moimted on said base plate and bearing against said shaft at the pofltion of said fiattened portions so that. said eccentric is stopped in its upper and lower podtion a pin adjustably mounted in saidiirst part and bearing'a'gainst said eccentric, so that the distance of said first part from said eccentric can be varied.

L30 GOLD. 

